TLV3201AQDCKRQ1 Voltage Comparator : Pin Configuration, Working & Its Applications

A voltage comparator is one type of electronic circuit, used to compare an input voltage through a known reference voltage & change its output condition based on the input whether it was below or above the reference. So this simply satisfies the need to detect nulls, threshold crossings & amplitudes of signal inside or outside of an amplitude range. Voltage comparators are classified into two types such as inverting and non-inverting. The different forms of these comparators are; single limit, window, hysteresis voltage range, and three-state voltage comparators. This article discusses an overview of the TLV3201AQDCKRQ1 voltage comparator.

What is TLV3201AQDCKRQ1 Voltage Comparator?

The TLV3201AQDCKRQ1 is a single-channel comparator that provides the ultimate combination of both 40 µA of low-power consumption & 40 ns high speed in very small packages. This voltage comparator features; 1 mV low offset voltage, large output drives current & rail-to-rail input. These comparators are also extremely simple to design and used where response time is significant. The family of TLV320x-Q1 is available in a single channel like TLV3201-Q1 and dual channel versions like TLV3202-Q1 by push-pull outputs. The TLV3202Q1 voltage comparator is accessible in the 8-pin VSSOP package whereas the TLV3201-Q1 is accessible in the 5-pin SC70 package.

TLV3201AQDCKRQ1 Voltage Comparator
TLV3201AQDCKRQ1 Voltage Comparator

Pin Configuration:

The pin configuration of the TLV3201AQDCKRQ1 voltage comparator is shown below. This voltage comparator includes 5 pins which are discussed below.

Pin Configuration

  • Pin1 (OUT): It is an output pin.
  • Pin2 (GND): It is a ground pin.
  • Pin3 (IN+): It is a positive input pin.
  • Pin4 (IN-): It is a negative input pin.
  • Pin5 (VCC): It is a positive supply pin.

Features & Specifications:

The features and specifications of the TLV3201AQDCKRQ1 voltage comparator are discussed below.

  • Category – Integrated circuit.
  • Manufactured by Texas Instruments.
  • The type of output is push-pull.
  • Voltage supply ranges from 2.7V to 5.5V.
  • The propagation delay is low like 40 ns.
  • Quiescent current is low like 40 µA for each channel.
  • The common mode range of input extends 200mV beyond any rail.
  • The input offset voltage is low like 1 mV
  • The package is 5-Pin SC70.
  • The maximum input bias current is 0.005µA.
  • The maximum quiescent current is 40µA.
  • Typical CMRR and PSRR are 70dB CMRR and 85dB PSRR.
  • Hysteresis is 1.2mV
  • Operating temperature ranges from -40°C to 125°C
  • The mounting type is surface mount.

TLV3201AQDCKRQ1 Voltage Comparator Circuit Diagram

The TLV3201AQDCKRQ1 Circuit Diagram is shown below. This is a single comparator with push-pull outputs. Similar to other comparators, this voltage comparator includes two inputs; inverting and non-inverting.

In this comparator circuit, an inverting input is denoted with a minus sign whereas a non-inverting input is denoted with a positive sign. The inputs of this comparator are very much similar to an operational amplifier but the output of this comparator is a digital logic state.

TLV3201AQDCKRQ1 Voltage Comparator Circuit Diagram
TLV3201AQDCKRQ1 Voltage Comparator Circuit Diagram

In the above circuit, the input is a 1 MHz sine wave with 200 mV peak amplitude. Once the voltage is higher at the non-inverting input compared to the inverting input, then the output of this comparator will be high. In this case, the result will be 2.5 volts. Similarly, once the voltage is lower at the non-inverting input compared to the inverting input, then the output of this comparator will be low. In this case, the result will be -2.5 volts.

The response time of this voltage comparator is 40 ns which is denoted as the propagation delay or speed. This response time is the time from the threshold crossing at the input until the output modifies the condition. The propagation speed will affect how quickly this comparator can switch conditions & bandwidth-related specifications. This voltage comparator has 1.2 mV of an inbuilt voltage hysteresis which opposes the existence of noise on the input signal.

Voltage Comparator with Hysteresis

The TLV3201 voltage comparator with hysteresis is given below for inverting and noninverting amplifiers. Hysteresis is the idea that the comparator’s output changes the circuit behavior. So this is very helpful for our circuit design because the voltage comparator might change its states without hysteresis because of small changes within the input which is not desirable.

Inverting Comparator with Hysteresis

The inverting comparator by hysteresis needs a three-resistor network as shown in the following circuit. Once Vin at the inverting input is below as compared to VA, then the output voltage will be high.

Inverting Comparator with Hysteresis
Inverting Comparator with Hysteresis

In this circuit, the three resistors are represented with R1, R2 & R3 where the R1 and R3 are connected in series by R2. The low input trip voltage like VA1 can be derived by the following equation.

VA1 = VCC x R2/ (R1 ||R3) + R2

Once the Vin is higher than VA then the o/p voltage of this comparator will be low So in this condition, the resistors in the circuit are connected as R2 and R3 are connected in series by R1. So the high input trip voltage like VA2 is derived by the following equation.

Non-inverting Comparator with Hysteresis

A non-inverting comparator with hysteresis needs a two-resistor circuit which is shown below with a reference voltage at the inverting input.

Non-inverting Comparator with Hysteresis
Non-inverting Comparator with Hysteresis

Once the VIN of this comparator is low, then the output can also be low. So to switch the output from low to high then VIN has to rise to VIN1. So, this can be calculated as;

VIN1 = R1 x (VREF/R2) x VREF

Once VIN is higher, then its output will be high. In order to switch this comparator back to a low condition then VIN should be equivalent to VREF before ‘VA’ is once more equivalent to VREF. So, VIN can be calculated as;

VIN2 = VREF(R1 + R2) – VCC x R1/R2

This circuit hysteresis is the main difference between VIN1 &VIN2 which is defined through the following equation.

ΔVin = Vcc x R1/R2


The applications of TLV3201AQDCKRQ1 voltage comparator include the following.

  • ECU or Engine Control Units.
  • BCM or Body Control Modules.
  • BMS or Battery Management Systems.
  • Detection of Occupant.
  • LIDAR & Ultrasonic Ranging.
  • Infotainment Systems HEV or EV Inverter & Motor Control.
  • Traction & Steering Controllers.
  • This comparator is used where response time is critical.
  • The TLV3201-Q1 voltage comparator is an excellent comparator mainly used for battery-powered, portable applications and fast-switching threshold detection like zero-cross detection and PWM output monitor.

Please refer to this link for TLV3201AQDCKRQ1 Voltage Comparator Datasheet.

Thus, this is all about an overview of TLV3201 voltage comparator – pin configuration, specifications, circuit, and its applications. This comparator was mainly chosen because it was not expensive and it has a low rise time like below 10ns. Here is a question for you, what is an operational amplifier?